<?php

if (!defined('BASEPATH'))
  exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006 - 2012 EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 2.0
 * @filesource	
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter APC Caching Class 
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		ExpressionEngine Dev Team
 * @link		
 */
class CI_Cache_apc extends CI_Driver {

  /**
   * Get 
   *
   * Look for a value in the cache.  If it exists, return the data 
   * if not, return FALSE
   *
   * @param 	string	
   * @return 	mixed		value that is stored/FALSE on failure
   */
  public function get($id) {
    $data = apc_fetch($id);

    return (is_array($data)) ? $data[0] : FALSE;
  }

  // ------------------------------------------------------------------------	

  /**
   * Cache Save
   *
   * @param 	string		Unique Key
   * @param 	mixed		Data to store
   * @param 	int			Length of time (in seconds) to cache the data
   *
   * @return 	boolean		true on success/false on failure
   */
  public function save($id, $data, $ttl = 60) {
    return apc_store($id, array($data, time(), $ttl), $ttl);
  }

  // ------------------------------------------------------------------------

  /**
   * Delete from Cache
   *
   * @param 	mixed		unique identifier of the item in the cache
   * @param 	boolean		true on success/false on failure
   */
  public function delete($id) {
    return apc_delete($id);
  }

  // ------------------------------------------------------------------------

  /**
   * Clean the cache
   *
   * @return 	boolean		false on failure/true on success
   */
  public function clean() {
    return apc_clear_cache('user');
  }

  // ------------------------------------------------------------------------

  /**
   * Cache Info
   *
   * @param 	string		user/filehits
   * @return 	mixed		array on success, false on failure	
   */
  public function cache_info($type = NULL) {
    return apc_cache_info($type);
  }

  // ------------------------------------------------------------------------

  /**
   * Get Cache Metadata
   *
   * @param 	mixed		key to get cache metadata on
   * @return 	mixed		array on success/false on failure
   */
  public function get_metadata($id) {
    $stored = apc_fetch($id);

    if (count($stored) !== 3) {
      return FALSE;
    }

    list($data, $time, $ttl) = $stored;

    return array(
        'expire' => $time + $ttl,
        'mtime' => $time,
        'data' => $data
    );
  }

  // ------------------------------------------------------------------------

  /**
   * is_supported()
   *
   * Check to see if APC is available on this system, bail if it isn't.
   */
  public function is_supported() {
    if (!extension_loaded('apc') OR ini_get('apc.enabled') != "1") {
      log_message('error', 'The APC PHP extension must be loaded to use APC Cache.');
      return FALSE;
    }

    return TRUE;
  }

  // ------------------------------------------------------------------------
}

// End Class

/* End of file Cache_apc.php */
/* Location: ./system/libraries/Cache/drivers/Cache_apc.php */
